A DNA molecule is a double helix shape
There are 4 different bases in a DNA molecule
Adenine and Thymine (which pair up using a double hydrogen bond)
Cystosine and Guanine (which pair up using a triple hydrogen bond)
A gene codes for a protein A triplet codon codes for an Amino Acid
A DNA has certain genes "switched on" in each cell which determines which proteins are created.
A polypetide is a chain of amino acids.
Protein synthesis- DNA is unzipped by an enzyme, Complementary mRNA molecules join up and when reach end of gene leave the nucleas. mRNA joins onto ribosome where tRNA joins on. tRNA has amino acids attached which join together to create proteins.
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